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question_answer1) A beam of light strikes a piece of glass at an angle of incidence of \[60{}^\circ \]and the reflected bema is completely plane polarised. The refractive index of the glass is?
question_answer2) A beam of plane polarized light falls normally on a polarizer of cross sectional area\[3\times {{10}^{-4}}{{m}^{2}}\]. Flux of energy of incident ray in\[{{10}^{-3}}W\]. The polarizer rotates with an angular frequency of 31.4 rad/s. The energy of light passing through the polarizer per revolution is\[{{10}^{n}}J\]. Find value of n.
question_answer3) When light of a certain wavelength is incident on a plane surface of a material at a glancing angle\[30{}^\circ \], the reflected light is found to be completely plane polarised. Determine angle of refraction. (in degree)
question_answer4) A mixture of plane polarised and unpolarised light falls normally on a polarising sheet. On rotating the polarizing sheet about the direction of the incident beam, the transmitted intensity varies by a factor of 4. Find the ratio of the intensities \[{{I}_{p}}\]and\[{{I}_{0}}\], respectively, of the polarised and unpolarised components in the incident beam.
question_answer5) Two Polaroids as oriented with their planes perpendicular to incident light and transmission axis making an angle \[30{}^\circ \]with each other. What fraction of incident unpolarised light is transmitted?
question_answer6) Unpolarised light of intensity\[32W{{m}^{-2}}\]passes through three polarisers such that the transmission axis of the last polarizer is crossed with the first. If the intensity of the emerging light is 3W\[{{m}^{-2}}\], what is the angle (in degree) between the transmission axes of the first two polarisers?
question_answer7) Light incident at angle \[60{}^\circ \]on a medium. Reflected light is found perfectly plane polarised. Find refractive index of that medium.
question_answer8) Unpolarised light of intensity\[32W{{m}^{-2}}\] passes through 3 polarisses such that the transmission axis of the last polariser is crossed with the first. If the intensity of emerging light is\[\frac{3W}{{{m}^{2}}}\]. The angle (in degree) between the transmission axis of the first two polarizer?
question_answer9) A slit of width a is illuminated by red light \[(\lambda =6500\overset{\text{o}}{\mathop{\text{A}}}\,)\]. The first minima for red light will fall at\[\theta =30{}^\circ \], when a will be (in micron)?
question_answer10) When the angle of incidence on the material is\[60{}^\circ \], the reflected light is completely polarised. The velocity of refracted ray inside the material is \[n\times {{10}^{8}}m/s\]. find value of n.
question_answer11) Unpolarised light with an intensity of \[{{I}_{0}}=16\]\[w/{{m}^{2}}\]is incident on a pair of polarisers. The first polariser has its transmission axis aligned at \[50{}^\circ \]from the vertical. The second polariser has its transmission aligned at \[20{}^\circ \]from the vertical. What is the intensity (in\[W/{{m}^{2}}\]) of the light? When it emerges from the second polarizer.
question_answer12) At what angle (in degree) should an unpolarised beam be incident on a crystal of\[\mu =\sqrt{3}\], so that reflected bean is polarized?
question_answer13) A beam of light strikes a piece of glass at angle of incidence of \[60{}^\circ \]and the reflected beam is completely plane polarised. The refractive index of the glass\[\sqrt{n}\]. Find value of n.
question_answer14) Fraunhofer diffraction pattern is observed at a distance of 2 m on screen, when a plane wavefront of \[6000{\AA}\]is incident perpendicularly on 0.2 mm wide slit. Width (in mm) of central maxima is?
question_answer15) \[\wedge \iota \gamma \eta \tau o\phi \,\,\omega \alpha \varpi \varepsilon \lambda \varepsilon \nu \gamma \tau \eta \,\,5000\oplus \iota \nu \chi \iota \delta \varepsilon \nu \tau \sigma \]\[o\varpi \varepsilon \rho \,\,\alpha \,\,\sigma \lambda \iota \tau \,\,o\phi \,\,\omega \iota \delta \tau \eta \,\,1\,\,\mu m\].The angular width of central maxima (in radian) will be?
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